Method for capturing blue crab cultured in pond

Abstract

The invention provides a method for capturing portunus trituberculatus cultured in pond, and is characterized in that the head of a table poultry, which is tied on a rope, is close to the bottom of the pond, and the portunus trituberculatus uses pincers to clasp tightly and then can be captured when the head of the carnivorous chicken is lifted out of water and can also be captured selectively according to sexes and sizes. The rope is a polyethylene rope on which floats are added and hung so as to form a float line; the float line is arranged on the water surface of the pond culturing the portunus trituberculatus, the head of the table poultry is drilled through with the polyethylene rope and tied to the float line and sunk to the bottom of the pond. The method is used for capturing the portunus trituberculatus selectively according to the sexes and sizes, has short operation time and can achieve the purpose of avoiding appendage from deforming due to mutual fighting of the portunus trituberculatus in a fixed net and protecting the shrimp which cultured in a mixing mode in culturing pond. By adopting the method, the survival rate of the culturing of the portunus trituberculatus is improved by 20 percent, the complete rate of the appendage of commercial crabs is improved by 30 percent and the economic benefit is obvious.

Description

technical field [0001] The invention belongs to the artificial cultivation technology of swimming crabs, in particular to a method for catching and cultivating swimming crabs trituberculatus in ponds. Background technique [0002] Portunus trituberculatus has long claws, bright abdomen, hard shell, less mud in the body, white and tender meat, rich nutrition and delicious taste. It is one of the important marine biological resources in my country. However, due to the overfishing of sea area fishery and the deteriorating environment, its natural resources are decreasing year by year, seriously affecting the sustainable development of the industry's economy. Artificial breeding began in the late 1980s along the northern coast of my country. In recent years, the breeding area and output of swimming crabs have increased by about 20% every year. The national swimming crab breeding output is nearly 100,000 tons, and the breeding area is 50,000 hectares. The breeding method of Port...

AI Technical Summary

Problems solved by technology

Due to the non-selective capture methods such as fixed nets and crab cages, the selectivity of shrimp and crab species, gender, and specifications is poor. In addition, the operation time is long, which seriously damages swimming crabs, which affects the survival rate of swimming swimming crabs and the integrity of appendages.